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{{Instrument Sidebar | manufacturer=Tektronix |
{{Instrument Sidebar  
model=494 |
|class=Spectrum Analyzer
class=Spectrum Analyzer |
|manufacturer=Tektronix  
summary=21 GHz Spectrum Analyzer |
|model=494
image=Tek 494P 1.jpeg |
|summary=21 GHz Spectrum Analyzer
caption=Tektronix 494 |
|image=Tek 494P 1.jpeg
introduced=1985 |
|caption=Tektronix 494
discontinued=1989 |
|introduced=1985
manuals=
|discontinued=1989
* [[Media:070-4418-00.pdf| Tek 494 & 494P Operator Manual (PDF)]]
|manuals=
* [[Media:070-4415-00.pdf| Tek 494P Programmer Manual (PDF)]]
'''494/494P'''
* [http://www.ko4bb.com/manuals/71.205.222.87/494psmv1_sm.pdf Tek 494 & 494P Service Manual Volume 1 (PDF)]
* [[Media:070-4418-00.pdf|494 & 494P Operator Manual]]
* [http://www.ko4bb.com/manuals/71.205.222.87/494psmv2_sm.pdf Tek 494 & 494P Service Manual Volume 2 (PDF)]
* [[Media:070-4415-00.pdf|494P Programmer Manual]]
* [[Media:070-4416-00.pdf|494 & 494P Service Manual Vol.1]]
* [[Media:070-4417-00.pdf|494 & 494P Service Manual Vol.2]]
'''494A/494AP'''
* [[Media:070-5560-00.pdf|494A & 494AP Service Manual Vol.1]]
* [[Media:070-5561-00.pdf|494A & 494AP Service Manual Vol.2]]
}}
}}
The '''Tektronix 494''' is a spectrum analyzer with a frequency range of 10 kHz to 21 GHz in coax, and up to 325 GHz with external waveguide mixers.  The '''P''' suffix designation indicates GPIB '''P'''rogrammability. The minimum resolution bandwidth is 30 Hz, and provides measurement resolution proportional to the frequency accuracy or span.
The '''Tektronix 494''' is a spectrum analyzer with a frequency range of 10 kHz to 21 GHz in coax, and up to 325 GHz with external waveguide mixers.   
The '''P''' suffix designation indicates GPIB '''P'''rogrammability.  


In 1988, the [[494A|494A /494AP]] successor model was introduced.
In 1988, the [[494A|494A /494AP]] successor model was introduced.
Front panel inputs/outputs are: RF INPUT 50Ω ([[N connector]]), CAL OUT ([[BNC connector]]), LO OUTPUTS ([[SMA connector|SMA connectors]]), EXTERNAL MIXER RF INPUT ([[TNC connector]]), and Camera Power. The LO outputs can be used to connect an external waveguide mixer like the [[WM490|WM490 series]], or to connect a [[TR503|TR503 tracking generator]].
Rear panel inputs/outputs are: PROBE POWER (Provides operating voltages (+5V, -15 V, +15 V; 100 mA max each) for active probes); HORIZ|TRIG (EXT IN) [[BNC connector]] (A dual function connector: When in External Triggering mode the connector is an AC coupled input for trigger signals.  When the TIME/DIV selection is EXT the connector is a DC coupled input for horizontal sweep voltages); MARKER/VIDEO (EXT IN) [[BNC connector]] (Available on instruments without Opt. 42 only.  See 110 MHz IF for Opt. 42 instruments.  This connector interfaces the spectrum analyzers with a Tektronix 1405 TV Adapter to display an externally-generated marker) 110 MHz IF (OUTPUT) [[BNC connector]] (Available on Opt. 42 utilizing the HORIZ (OUTPUT) connector.  This connector provides 110 MHz IF output with a bandwidth greater than 5 MHz.  Input external video signals into the PEN LIFT connector); HORIZ (OUTPUT) [[BNC connector]] (Supplies a 0.5 V/div horizontal signal); VERT (OUTPUT) [[BNC connector]] (Provides access to the video signal with 0.5 V for each division of displayed video above or below the center line.)
NOTE: Both HORIZ and VERT output signals are driven from digital storage if it is on.  Both signals are driven from the analyzer sweep and video amplifier stage if digital storage is off;
PEN LIFT (OUTPUT) [[BNC connector]] (Provides access to a TTL compatible signal to lift the pen of a chart recorder during sweep retrace.  This signal is always derived from the spectrum analyzer sweep.  In Opt. 42 instruments, use this connector to input external video signals if pin 1 of the ACCESSORIES connector is grounded; 10 MHz IF (OUTPUT) [[BNC connector]] (Provides access to the output of the 10 MHz IF); EXT REF IN [[BNC connector]] (A 50Ω input for a 1, 2, 5, or 10 MHz external reference signals, within -15 dBm to +15 dBm level.  Input signals must be a sinewave with a duty cycle symmetry of 40% to 60%, or ECL or TTL); J104 ACCESSORY female [[DB25 connector]] (Provides external video input selector on Pin 1 and external preselector out on Pins 2 and 3, Pin 5 is ground.); IEEE STD 488 PORT [[GPIB interface]] (Added to all "P" suffixed instruments)


{{BeginSpecs}}
{{BeginSpecs}}
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* 15 GHz to 21 GHz
* 15 GHz to 21 GHz
* [[WM490|External Waveguide mixers:]] 18 GHz to 325 GHz }}
* [[WM490|External Waveguide mixers:]] 18 GHz to 325 GHz }}
{{Spec | Frequency Span Range (plus 0 Hz and MAX) | 50 Hz/Div to 500 MHz/Div in 1, 2, 5 sequence }}  
{{Spec | Frequency Span | 50 Hz/Div to 500 MHz/Div in 1–2–5 sequence, plus 0 Hz and MAX }}  
{{Spec | Resolution Bandwidth Range (-6 dB bandwidth) | 30 Hz, then 100 Hz to 1 MHz in decade steps }}  
{{Spec | Resolution Bandwidth | 30 Hz, then 100 Hz to 1 MHz in decade steps (-6 dB) }}  
{{Spec | RF Input impedance | 50Ω }}
{{Spec | RF Input | 50 Ω, max. +30 dBm (1 W) CW or 75 W peak pulse (1 µs, 0.1% duty factor) }}
{{Spec | Maximum Safe Input Power | CW: +30 dBm (1 W); Pulse: 75 W Pk (1 µS pulse, 0.1% duty factor) }}
{{Spec | RF Attenuator | 0 dB to 60 dB, 10 dB steps }}
{{Spec | RF Attenuator Range | 0 dB to 60 dB, 10 dB steps }}
{{Spec | Reference Level | –117 dBm to +40 dBm }}  
{{Spec | Reference Level Range | -117 dBm to +40 dBm }}  
{{Spec | Sweep Speed | 10 sec/div to 20 µs/div in 1, 2, 5 sequence }}
{{Spec | Sweep Speed Range | 10 sec/div to 20 µs/div in 1, 2, 5 sequence }}
{{Spec | Video Bandwidth Filter | Normal, Wide: 1/30, or Narrow: 1/300 of resolution bandwidth }}
{{Spec | Video Bandwidth Filter |  
* Normal
* Wide 1/30 of resolution bandwidth
* Narrow 1/300 of resolution bandwidth}}
{{Spec | Triggering Modes | Free Run, Line, Video, Single, External }}
{{Spec | Triggering Modes | Free Run, Line, Video, Single, External }}
{{Spec | Display Dynamic Range | 80 dB }}  
{{Spec | Display Dynamic Range | 80 dB }}  
{{Spec | Calibrator (Cal out) | 50Ω, -20 dBm ±0.3 dB at 100 MHz }}
{{Spec | Calibrator (Cal out) | 50 Ω, –20 dBm ±0.3 dB at 100 MHz }}
{{Spec | Included Accessories | Operator’s Manual; Programmer Manual; 6-ft 50Ω coaxial cable N-N; 18-inch 50Ω coaxial cable BNC-BNC; N male to BNC female adapter; [[015-0385-00|Diplexer Assembly]]; Power Cord; spare fuses; CRT filter set consisting of amber and gray light filters plus mesh filter }}
{{Spec | Weight | 24 kg (52 lbs) with standard accessories }}  
{{Spec | Weight | 24 kg (52 lbs) with standard accessories }}  
{{Spec | Power | 90 − 132 V<sub>AC</sub>, 48 to 440 Hz; 180 – 250 V<sub>AC</sub>, 48 to 440 Hz.  At 115 V<sub>AC</sub>, 60 Hz, 210 W max }}
{{Spec | Power | 90 − 132 V<sub>AC</sub>, 48 to 440 Hz; 180 – 250 V<sub>AC</sub>, 48 to 440 Hz, 210 W max }}
{{Spec | Operating Atmospherics | Temperatures: -15 °C to +55 °C;  Humidity: Five cycles (120 hours) MIL-STD-810; Altitude: Up to 4.6 km (15,000 ft) }}
{{Spec | Operating Environment | –15 °C to +55 °C, Humidity: Five cycles (120 hours) MIL-STD-810; Altitude: Up to 4.6 km (15,000 ft) }}
{{Spec | GPIB Characteristics | In accordance with IEEE Standard 488-1978 implemented as SH1, AH1, T5, L3, SR1, RL1, PP1, DC1, DT1, and C0 }}
{{EndSpecs}}
{{EndSpecs}}


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* Opt. 42: Replaces MARKER/VIDEO input port on the rear panel with a 110 MHz IF output port that provides a 6 dB signal bandwidth ≥ 5 MHz
* Opt. 42: Replaces MARKER/VIDEO input port on the rear panel with a 110 MHz IF output port that provides a 6 dB signal bandwidth ≥ 5 MHz
* Opt. 45: MATE/CIIL language interface
* Opt. 45: MATE/CIIL language interface


==Links==
==Links==
* [http://www.ko4bb.com/Test_Equipment/Tek7L18-492-494_compared.php Comparison of 494] with [[492]] and [[7L18]]
* [http://www.ko4bb.com/Test_Equipment/Tek7L18-492-494_compared.php Comparison of 494] with [[492]] and [[7L18]]
* [http://www.ke5fx.com/49x_notes.pdf 49x Service notes @ John Miles KE5FX]
* [http://www.ke5fx.com/49x_notes.pdf 49x Service notes @ John Miles KE5FX]
==Connections==
<small>
Front panel inputs/outputs are: RF INPUT 50Ω ([[N connector]]), CAL OUT ([[BNC connector]]), LO OUTPUTS ([[SMA connector|SMA connectors]]), EXTERNAL MIXER RF INPUT ([[TNC connector]]), and Camera Power. The LO outputs can be used to connect an external waveguide mixer like the [[WM490|WM490 series]], or to connect a [[TR503|TR503 tracking generator]].
Rear panel inputs/outputs are: PROBE POWER (Provides operating voltages (+5V, -15 V, +15 V; 100 mA max each) for active probes); HORIZ|TRIG (EXT IN) [[BNC connector]] (A dual function connector: When in External Triggering mode the connector is an AC coupled input for trigger signals.  When the TIME/DIV selection is EXT the connector is a DC coupled input for horizontal sweep voltages); MARKER/VIDEO (EXT IN) [[BNC connector]] (Available on instruments without Opt. 42 only.  See 110 MHz IF for Opt. 42 instruments.  This connector interfaces the spectrum analyzers with a Tektronix 1405 TV Adapter to display an externally-generated marker) 110 MHz IF (OUTPUT) [[BNC connector]] (Available on Opt. 42 utilizing the HORIZ (OUTPUT) connector.  This connector provides 110 MHz IF output with a bandwidth greater than 5 MHz.  Input external video signals into the PEN LIFT connector); HORIZ (OUTPUT) [[BNC connector]] (Supplies a 0.5 V/div horizontal signal); VERT (OUTPUT) [[BNC connector]] (Provides access to the video signal with 0.5 V for each division of displayed video above or below the center line.)
NOTE: Both HORIZ and VERT output signals are driven from digital storage if it is on.  Both signals are driven from the analyzer sweep and video amplifier stage if digital storage is off;
PEN LIFT (OUTPUT) [[BNC connector]] (Provides access to a TTL compatible signal to lift the pen of a chart recorder during sweep retrace.  This signal is always derived from the spectrum analyzer sweep.  In Opt. 42 instruments, use this connector to input external video signals if pin 1 of the ACCESSORIES connector is grounded; 10 MHz IF (OUTPUT) [[BNC connector]] (Provides access to the output of the 10 MHz IF); EXT REF IN [[BNC connector]] (A 50Ω input for a 1, 2, 5, or 10 MHz external reference signals, within -15 dBm to +15 dBm level.  Input signals must be a sinewave with a duty cycle symmetry of 40% to 60%, or ECL or TTL); J104 ACCESSORY female [[DB25 connector]] (Provides external video input selector on Pin 1 and external preselector out on Pins 2 and 3, Pin 5 is ground.); IEEE STD 488 PORT [[GPIB interface]] (Added to all "P" suffixed instruments)
</small>
==Accessories originally included==
Operator’s Manual; Programmer Manual; 6-ft 50Ω coaxial cable N-N; 18-inch 50Ω coaxial cable BNC-BNC; N male to BNC female adapter; [[015-0385-00|Diplexer Assembly]]; Power Cord; spare fuses; CRT filter set consisting of amber and gray light filters plus mesh filter }}


==Pictures==
==Pictures==
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Tek 494 internal bottom.jpg|Internal bottom view
Tek 494 internal bottom.jpg|Internal bottom view
</gallery>
</gallery>
{{Custom ICs|494}}
{{Custom ICs|494P}}
{{Custom ICs|494A}}
{{Custom ICs|494AP}}


[[Category:Spectrum analyzers]]
[[Category:Spectrum analyzers]]
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